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Honeywell Sensing & Control MICRO SWITCH EN NH Limit Switches

Honeywell Sensing & Control MICRO SWITCH EN NH Limit Switches are bushing-mount designed, manufactured, and qualified to aerospace standards. These Honeywell devices provide a durable switch for commercial aircraft and commercial and heavy-duty ground-based equipment. Other applications for EN NH Limit Switches include off-road equipment, where severe environments are encountered. MICRO SWITCH EN products are highly configurable, offering a variety of integral actuators, electrical circuitries, and electrical terminations.

Features

  • One-pole single throw (1PST) circuit to four-pole double throw (4PDT) circuits for position indication of different independent circuits or providing redundant circuit capabilities
  • Rugged stainless steel housing and bushing
  • All-metal drive train for consistent operating characteristics at high or low temperatures
  • Suitable for non-military applications
  • Resilient environmental sealing to keep dust, water, and ice from entering the switch enclosure
  • Silver-alloy switch contacts for reliably controlling electrical loads from up to 4A (power duty)
  • Wide -54°C to +85°C (-65°F to +185°F) operating temperature range for sea-level or high-altitude commercial applications
  • Assortment of switch actuators and electrical terminations
  • Miniature package size (400EN and 600EN) reduces housing diameter by 30% for smaller space required on equipment

Applications

  • Landing gear systems for commercial aircraft and helicopters
    • Weight-on-Wheels (WOW) switches for landing gear
    • Up-lock and down-lock sensing
    • Landing gear bay doors closed/locked
  • External doors and hatches for commercial aircraft and helicopters, closed and locked indication
    • Passenger entry/exit doors
    • Cargo bay doors
    • Other doors or hatches [refueling doors or auxiliary power unit (APU) air inlet doors]
  • Heavy-duty vehicles - doors or hatches closed/locked or open
  • Off-road construction equipment
    • Doors or panels present/closed/open
    • Up-stop or down-stop limits

Specifications

  • 25,000 cycles minimum mechanical endurance
  • 25,000 cycles minimum at rated load electrical endurance
  • Up to 4A at 28VDC electrical rating
  • 1000VRMS, 5mA maximum leakage initial dielectric strength
  • 500VDC, 100MΩ minimum initial insulation resistance
  • 100g shock
  • 10g peak (10HZ to 500Hz) vibration

Circuitry Diagram

Location Circuit - Honeywell Sensing & Control MICRO SWITCH EN NH Limit Switches

Typical EN Switch Construction

Block Diagram - Honeywell Sensing & Control MICRO SWITCH EN NH Limit Switches
Published: 2025-02-25 | Updated: 2025-12-12